Arbitrary double vector model prediction thrust control method and system for linear induction motor

Abstract

The invention provides an arbitrary double vector model prediction thrust control method and system for a linear induction motor, and belongs to the technical field of linear induction motor control.In allusion to deficiencies existing in the traditional model prediction thrust control and problems of high thrust and flux linkage pulsation caused by the operation on only one voltage vector in each switching period, the method adopts two voltage vectors in one period by combining a double vector modulation algorithm and improves the modulation accuracy, thereby being capable of reducing the pulsation amplitude, and improving the motor operation performance. The complexity of the algorithm is increased after adding the double vector modulation strategy, and the calculating and solving process is too complex, so that the invention further provides a simplified search process to replace the traditional repeated calculation and comparison method, and there is no need to perform the complexonline calculation process, thereby simplifying the implementation process of the algorithm in an actual system.

Description

technical field [0001] The invention belongs to the technical field of linear induction motor control, and more specifically relates to a method and system for predicting thrust of a linear induction motor with arbitrary dual-vector models. Background technique [0002] Linear induction motors can directly output thrust to generate linear motion. Therefore, they have been widely used in the field of urban rail transit in recent years. Compared with the subway driven by the traditional rotating motor, it has the advantages of strong climbing ability, small turning radius, flexible line selection, and low engineering cost. Due to the special open magnetic circuit structure of the linear motor, the edge effect is caused, the mutual inductance of the motor changes drastically, and the thrust attenuation at high speed is serious. Traditional control strategies, such as vector control and direct torque control, do not consider the influence of edge effects, resulting in unsatisfa...

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